Please load it up, ASAP.

every change should be an improvement.
For the new units: decrease the spider-stats, they are way over the top (change from elefant to infantry or slow cacalery (perhaps with high charge-range), reduce armor). IMO they are completly strange: can't see them having insane high armor. Spiders are soft. Should have high attack, high defence, no armour, low morale.
Ostgiliath Pikeman: they are a Joke at the moment (don't know if intented or by mistake): High End AOE unit with milita stats -> useless. Should have roughtly the stats of Fountainguard, but with Pikes instead of spears. You need a reward if you ever rebuild Ostgiliath (is it even possible at given growth rates? I doubt it)
If you wanna change some things with Rc in general: get rid of "armor piercing" (except for siege weapons). Its the most game breaking attribute. This could end up that you loose more armored troops (E.g. dragonslayers) to armor piercing enemys than unarmored (eg. dwarven miners), which is really strange.
If you want to represent very deadly troops increse attack rating and attack speed instead. IMO way more elegant.